contains method on immutable sorted array

[Nicholas Wilson]

On Monday, 21 October 2019 at 10:14:54 UTC, Andrey wrote:
> Hello,
> I have got a global constant immutable array:
>> immutable globalvalues = sort(cast(wstring[])["й", "ц", "ук", 
>> "н"]);
>
> Somewhere in program I want to check an existance:
>> globalvalues.contains("ук"w).writeln;
>
> But get an error:
>> Error: template std.range.SortedRange!(wstring[], "a < 
>> b").SortedRange.contains cannot deduce function from argument 
>> types !()(wstring) immutable, candidates are:
>> /dlang/ldc-1.17.0/bin/../import/std/range/package.d(10993):
>> std.range.SortedRange!(wstring[], "a < 
>> b").SortedRange.contains(V)(V value) if 
>> (isRandomAccessRange!Range)
>
> Why I can't check?

pragma(msg,typeof(globalvalues));

gives immutable(SortedRange!(wstring[], "a < b"))

and

(cast(SortedRange!(wstring[], "a < 
b"))globalvalues).contains("ук"w).writeln;

works, so I guess contains doesn't work with immutable?
If you can do some more research into this and confirm it then, 
please file a bug report.